General consensus on Mavericks?

What is the general consensus ( if any! ) on OX Mavericks, is it worth upgrading? Are there any problems with the upgrade process and any issues afterwards ( computer slowing down, battery usage increase, conflicts with other software ) or have these been sorted out?

I have a 2012 17inch MacBook Pro running Lion and have not bothered upgrading to ML mainly due to the horror stories I've heard from other people but am now considering Mavericks. I have Lightroom 5.3, are there any known issues using LR5 with Mavericks?

What is your opinion? Also, I have Time Machine backups from new, if I wanted to downgrade back to Lion, can I do it using the time Machine? I do not have the Lion disk, the OX was pre-instlled on my MacBook.